Red Hat Security Advisory: Red Hat Hardened Images RPMs Security Update
Affects Red HatSource GCVE Database
Not known to be exploited · CVSS 8.7 High : upgrade Red Hat to 1.20.2 soon.
Data as of 30 Oct 2026, 01:47 UTC
Thin evidence
One scorer or none| CNA (GitHub_M) | CVSS 4.0 | 8.7 |
|---|
- Patch
- Available – fixed in 1.20.2
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:NExploitation evidence
Disclosed: evidence found.
CVE published 26 Oct 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 29 Oct 2026.
What to do
Upgrade compress to 1.20.2.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| klauspostcompress | Affected
| Fixed in
|
AI-suggested
Red Hat has released updated RPM packages that fix this vulnerability. Users should apply these security updates promptly. In addition, it is recommended to reject or filter untrusted Zstandard compressed payloads at ingress points or restrict decompression endpoints to authenticated and trusted clients. There is no direct configuration workaround within the library itself.
Description
A vulnerability (CVE-2026-116591) exists in the klauspost compress library's Zstandard (zstd) decompression implementation used in Red Hat Hardened Images RPMs. An integer handling flaw in the decompression logic allows a remote attacker to submit a specially crafted compressed stream that triggers an out-of-bounds read and causes an unhandled panic, resulting in a denial of service (DoS). The impact is limited to application crashes without escalation beyond container or non-root boundaries. No direct fix is available within the library itself, but Red Hat has issued updated RPMs addressing this issue.
References
- access.redhat.com/errata/RHSA-2026:91647 (opens in a new tab)
- access.redhat.com/security/cve/CVE-2026-116591 (opens in a new tab)
- access.redhat.com/security/updates/classification/ (opens in a new tab)
- images.redhat.com (opens in a new tab)
- security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_91647.json (opens in a new tab)